单项选择题

We usually have a lot of staff illness ______ the winter period.

A．for
B．since
C．over
D．while
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As a father I ______ the mess my children make every evening.
A．used to clean up
B．am used to cleaning up
C．had to clean up
D．willing to clean up
单项选择题
This is the place ______ I used to camp when I was younger.
A．what
B．when
C．where
D．which
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